Finally, it's time to give IP Masquerading an official try after all this hard
work. If you haven't already rebooted your Linux box, do so to make sure the
machines boots ok, executes the /etc/rc.d/rc.firewall ruleset, etc. Next, make
sure that both the internal LAN connection and connection of your Linux hosts
to the Internet is okay.

Follow these -11- tests to make sure all aspects of your MASQ setup is
running properly: